Wade
FeralNormal master
Another reason the burden of proof rests on those making claims for the existence of something or another is that only THEY know what it is they are asserting the existence of that they want disproven! This could not be more true than when considering paranormal subjects like supernatural beings. The burden of proof is on the one claiming the existence of largely undefined and unknown things and not the other way around. If person A approaches person B and says, "Prove that X [X is your favorite supernatural being or creature] does not exist!" The first order of business would be for person A to communicate what X was to B! B has no reason or obligation to mount an argument against the existence of something they know nothing about and quite possibly have not interest in.
The burden of proof lies squarely with the one making the assertion that something exists to be disproved in the first place.
very good footwork there !!